Well so far for longevity the Dunlop E3's have been the best. I tried the Bridgestones and they grip a lot better, but don't get the longevity. So its a toss up of what you want. Just bought the new Metzler ME888's but don't have them on yet.
As for a seat I have an Ultimate. I would have bought the Mustang, but when I first bought my bike back in 12 Mustang said they weren't going to make a seat for the XCT. But now they do. The Ultimate is better than stock but its name is a little misleading. Its a fair seat. I had the Mustang on my Vulcan 900 and loved it.
Guess I should say I have over 43K on the bike now so I have some miles on it, the seat, and tires.